英雄岭地区新生代构造特征及其对砂岩型铀矿的控制作用

Cenozoic Structure Characteristics in Yingxiongling Area and Its Control on Sandstone-type Uranium Deposit

柴达木盆地英雄岭地区新生界沉积巨厚,新生代构造变形强烈,是研究构造变形的理想场所,也是近年来新圈定的砂岩型铀矿找矿远景区。文章综合前人研究成果,通过构造物理模拟分析英雄岭地区构造特征和构造变形过程,将英雄岭地区新生代构造演化分为喜山运动早-中期的斜坡构造发育期和喜山运动晚期褶皱构造叠加改造期。结合英雄岭地区砂岩型铀矿化展布规律及其成矿条件分析,探讨了新生代构造运动对砂岩型铀成矿的控制作用,建立了“斜坡构造+断裂构造+油气还原”和“斜歪褶皱+构造天窗+有机质”两种“构造-铀成矿模式”,提出了发育残留斜坡构造的区段为区内砂岩型铀矿找矿优选区。

The Cenozoic sediments in Yingxiongling area of Qaidam Basin are very thick with strong structural deformation,which is believed ideal for structural deformation study and also a new prospecting area for sandstone-type uranium deposits.Based on previous research results,the structural characteristics and deformation process of Yingxiongling area were analyzed by physical simulation.The Cenozoic structural evolution of Yingxiongling area was divided into the slope structural development period in the early-middle Himalayan movement and the superimposed reconstruction period of fold structure in the late Himalayan movement.Combined with the distribution of sandstone-type uranium mineralization and the analysis of metallogenic conditions,the control effect of Cenozoic tectonic movement on sandstone-type uranium mineralization was discussed,and two structure-uranium metallogenic models were established,which are“slope structure+fault structure+oil and gas reduction”and“oblique fold+structural skylight+organic matter”.It has been proposed that the section with residual slope structure is the preferred prospecting area for sandstone-type uranium deposits in the area.